Machine for sharpening drills



(No Model.)

J. GUTBERLET.

MACHINE FOR SHARPENING DRILLS.

No. 459,931. Patented Sept. 22; 189 1 Arm/r YJ UNITED STATES PATENT OFFIE.

J OHANNES GUTBERLET, OF JERSEY CITY, NEW JERSEY.

-MACHINE FOR SHARPENING DRILLS.

SPECIFICATION forming part of Letters Patent No. 459,931, datedSeptember 22, 1891. Application filed March 24, 1891. Serial No.386,221- (No model.) Patented in Germany February 27, 1884, No. 28,939-

To all whom it may concern.-

Be it known that I, J OHANNES GUTBERLET, a citizen of the German Empire,residing at Jersey City, in the county of Hudson and State of NewJersey, have invented certain new and useful Improvements in Machinesfor Forging and Sharpening the Cutters of Rock-Drills, (which waspatented to me in Germany by Letters Patent No. 28,939, datedFebruary27, 1884,) of which the following is a specification.

This invention relates to an improved machine for forging and sharpeningthe cutters of rock-drills; and the object of myinvention is to providea machine of this kind by means of which the cutter-tools of rock-drillscan be sharpened very rapidly.

The invention consists in the combination, with a suitable frame, of tworeciprocating spring-hammers provided with tappets and two shaftsprovided with cams adapted to act on the tappets for the purpose ofwithdrawing the hammers to permit the springs to throw them forciblyagainst the tools resting on suitable anvils.

The invention also consists in the construction and combination of partsand details, which will be fully described hereinafter, and finallypointed out in the claim.

In the accompanying drawings, Figure 1 is a side View of my improvedmachine for forging and sharpening the cutters of rock-drills. Fig. 2 isan end elevation of the same, and Fig. 3 is a face and side View of oneof the tools.

Similar letters of reference indicate corresponding parts.

In the frame A the two shafts B B are mounted and are provided ontheirends with the two cog-wheels C C, engaged with each other, one ofthe shafts being provided with a crank-handle D for turning it, or itmay be provided with a belt pulley for applying power. The shaft 13carries two cams E E, and the shaft B a single cam E.

In suitable bearings or guides in the frame the two hammer-rods F F arearranged at an inclination to each other and are provided at their lowerends with the hammer-heads G G, respectively. Springs H H, surroundingthe hammer-rods and resting against the guides of the frame and thetappets J J on the hammer-rods, serve to press said hammer-rodsdownward. The tappets J J are so arranged that the cams E E can act onthe same and draw the hammer-rods and hammer-heads upward until saidtappets are released by the cams, when the expanding springs H H throwthe hammer-rods downward forcibly and the hammer-heads G G strike thetool K, placed on the anvil M. The ham mer-head G is used to flatten andwiden the end of the tool L, as shown at a, Fig. 3, and the hammer-headG serves to bevel and finish the ends of the said flattened and widenedpart a, as shown at a Fig. 3. As more strokes are required to flattenand widen the end of the tool, the shaft Bis provided with two cams E incontradistinction to the shaft B, which has only one cam E, so that thehammer-head G makes twice as many strokes as the hammer-head G.

The machine is operated by turning the cam-shafts in anysuitable manner,and if the machine is speeded sufficiently from sixty to one hundred andtwenty strokes can be made in a minute.

Having thus described my invention, I

claim as new and desire to secure by Letters Patent In a machine forforging and sharpening the cutters of rock-drills, the combination, witha frame, of two hammer-rods arranged and guided in said frame andinclined toward each other, a tappet on each hammer-rod, a springsurrounding each hammer-rod and adapted to press the same downward, ahead on the lower end of each hammer-rod, an anvil. below thehammer-heads, which anvil has two inclinations adapted to receive theends of the tool while the same is being acted on by the hammer-heads,two cam-shafts having cams adapted to act on the tappets, a gearwheel oneach cam-shaft, which gear-wheels are engaged,and means applied on oneof the cam-shafts for turning it, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

JOHANNES GUTBERLET. Witnesses:

PAUL GOEPEL, A. M. BAKER.

